/Engine/Source/Runtime/Slate/Public/Widgets/Text/SMultiLineEditableText.h
Called when the fraction and offset of the horizontal scroll area has been recalculated. This function should apply the new values to any scrollbars, and return a clamped horizontal scroll value
virtual float UpdateAndClampHorizontalScrollBar ( const float InViewOffset, const float InViewFraction, const [EVisibility](API\Runtime\SlateCore\Layout\EVisibility) InVisiblityOverride )